Text parameter is treated as sql query in postgresql function

I am using postgres crosstab() function to create a table.

My first dynamic query function (dynamic_crosstab) creates a sql select statement containing crosstab(), and then this select statement gives the final result on execution. dynamic_crosstab functions works perfectly

I need to execute this select query (result of dynamic_crosstab function) by using parameters, so I am again using a function as follows.

CREATE OR REPLACE FUNCTION leavetypeaccrual(

   cur refcursor,

    text,

    text,

    text)

  RETURNS SETOF refcursor AS

$BODY$

declare

val_1 text;

begin

select * from dynamic_crosstab($ select

p.location_id, p.employee_id, pt.description, sum(p.hours_allocated) as hours_allocated

from

preference_type pt, preference p, preference_date_etl pde, date_etl de

where

pt.id = p.preference_type_id and

pde.preference_id = p.id and

pde.corporation_id = $4 and

de.id = pde.date_etl_id and

pde.deleted = ''N'' and

p.deleted = ''N'' and

pt.deleted = ''N'' and

de.local_date between ''$2'' and ''$3'' and

p.employee_id IN (

select id from employee where user_id IN ( select id from app_user where corporation_id =||$4||))

group by p.location_id, p.employee_id, pt.description $,

$ select distinct description from preference_type where deleted =''N'' and corporation_id=$ || $4,

'text','location_id int , employee_id int',false)  into val_1;

open cur for execute val_1;

return next cur;

end;

$BODY$

Now this function should execute the crosstab() function and it does when I use deleted= 'N' in the second parameter but shows error because crosstab() needs deleted=''N'' to execute. 

And I need to use deleted=''N'' to get my results but postgres treats my second parameter as a individual query when I try to do it. 

The first parameter is passed perfectly with deleted =''N''  but postgres does not recognize second parameter when deleted=''N''.

Please suggest what modifications I should do to make this work.

Thanks.